.collapse-exited {
  display: none;
}
.collapse-exiting {
  height: 0!important; 
}
.collapse-enter {
  height: 0
}
.collapse-entered {
  height: 53px!important;
}
.collapse-entering {
  height: 53px!important;
}
.collapse {
  overflow: hidden;
  transition: height 0.3s ease-in-out;
}